"I would strive to get at least 250 mg of vitamin C from natural sources and 25 mcgs of vitamin D mostly from supplements in the wintertime."
I'm aware of the arguments for up to 2 g/day of C, but is there any national or international authority that has put their name on an RDI above 90 mg/day? And, I'm curious about your recommendation for D - the 10 ug/day I quote is already double that for younger people. I realise that Finland at 70 degrees latitude gets a lot less sun than Ottawa at 45 (especially in winter!) and I do spend a lot of time outdoors (see http://sankey.ws/naturalist.html), but again is there any 'authority' who backs 25 ug?
Minimum daily intake to sustain life without disease.
In other words...below that amount you may get sick or die. Wanna' sit on the fence?
"John Sankey" <[email hidden]> wrote in message news:[email hidden]...
Quoted message said:
"I would strive to get at least 250 mg of vitamin C from natural sources and 25 mcgs of vitamin D mostly from supplements in the wintertime."
I'm aware of the arguments for up to 2 g/day of C, but is there any national or international authority that has put their name on an RDI above 90 mg/day? And, I'm curious about your recommendation for D - the 10 ug/day I quote is already double that for younger people. I realise that Finland at 70 degrees latitude gets a lot less sun than Ottawa at 45 (especially in winter!) and I do spend a lot of time outdoors (see http://sankey.ws/naturalist.html), but again is there any 'authority' who backs 25 ug?
John Sankey wrote: :: "I would strive to get at least 250 mg of vitamin C from natural :: sources and 25 mcgs of vitamin D mostly from supplements in the :: wintertime." :: :: I'm aware of the arguments for up to 2 g/day of C, but is there any :: national or international authority that has put their name on an RDI :: above 90 mg/day? And, I'm curious about your recommendation for D - :: the 10 ug/day I quote is already double that for younger people. I :: realise that Finland at 70 degrees latitude gets a lot less sun than :: Ottawa at 45 (especially in winter!) and I do spend a lot of time :: outdoors (see http://sankey.ws/naturalist.html), but again is there :: any 'authority' who backs 25 ug?
RDIs are not the same as optimal intakes. I don't think that there is any good authorititative source about optimal intakes. Best that I have found is this http://lpi.oregonstate.edu/infocenter/foods.html
Yes, there are highly respected vitamin D researchers to suggest 25 mcgs a day. For elder people at least 32,5 mcgs is a minimum. I suggest that you look at the studies by Vieth, Heaney, Holick, Grant and others. *No* vitamin D is formed on the skin at latitude 45 North in the midwinter. I live at 60 North (Helsinki, Finland).
